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https://issues.apache.org/jira/browse/HBASE-15457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194416#comment-15194416
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stack commented on HBASE-15457:
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HFIleBlock has notion of a block 'range'. HFileReaderImpl gets an iterator on
the block range on construction. The range is set to be the whole file using
offset to start of data minus the tail. It looks hard plumbing in an iterator
that was constrained by index content.. Something to consider when doing a Get
on a row.... could do an index-based calculation up front.
> [performance] Save-a-seek; hint HFileReader when Scan is a "Get" Scan
> ---------------------------------------------------------------------
>
> Key: HBASE-15457
> URL: https://issues.apache.org/jira/browse/HBASE-15457
> Project: HBase
> Issue Type: Bug
> Reporter: stack
>
> Have the Scan hint the lower-level Reader when its a 'Get' Scan. Reader is
> currently doing checks for EOF and when time to load next block on each next
> invocation. Seems easy enough to return null/end-of-scan if a get-scan and
> the next block is a different row.
> Prompted by @daniel pol questions/suggestions over on HBASE-15392; see
> towards the end.
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